Continuous wire mill



Nov. 14, 1933. J. GASSEN CONTINUOUS WIRE MILL Filed Aug. 22, 1952INVENTOR. J0EE? EHEEEN. BY M ATTORNEY.

Ito which twoJ-parallel wires were passed, was sub-.

Patented Nov. 14, 1933 twp;

g'con'rnvuous WIRE I .los ef Gassen, Dusseldorf, .Ger many/assignor toSchloemann Aktiengesellschaft,, Dusseldorf,

Germany, arcorporation of Germany- 1 Application August .22, 1932,.serial No. 629,'l,67, a and in Germany: September 24, 1931 iciaims; (Cl.80%35) My invention-relates to continuous wire mills in which'thewire'is finished in a continuous operation. The-first'rolling mills'ofthis kindconsisted of several groups'of housings, in which the last one,i. e. the finishing group was driven by means of a complicated beltdrive. The wire thus produced has mostly a diameterof about five" (5)millimeters. j The initial material fromv which this wire is rolled,usually are bars, fifty 7 10 (50) millimeters square. These initialand'final cross-sections determine on the basis'of the continuousrolling principlethe number of housings, while the output to be obtainedis determined by the speed at which the wire leaves the finishing '25rolls; Because'of the small weight per meter of Wire having a diameteroffive (5) millimeters,

the speed with which thewire leaves the finishing rolls, must be veryhigh's o as to' obtain an economical production.v But it was found again.20 ndagain that as regards the speed at the finishing rolls'there arelimits, due to practically insurmountable difliculties;

ii Inorder to reach 'afi output insuring to some 7 extent the profitableoperation of such a plant 3 one proposed to so designthe housing of thefinishing rolls that two wires would leavesaid rolls 7 instead of onewire, whereby the output, if not doubled, was at-least considerablyincreased. This, however, also continually involved unexpecteddifiiculties which it was hard to overcome and the causes of which'largely remained unexplained. One of the most pronounced drawbacks wasthe impossibility to produce clean, round wire of uniform diameter,since the two 13 passes in each group of finishing rolls could not bemaintained in accurate relative adjustment, as is necessary for theproduction of a faultless rolled product. I

Later on, the group of finishing rolls, through divided into twoindependent groups of housings arranged parallel to each other, and ineach .of these housings only one wire was rolled. By this expedient, onehad hopedto be able to so adjust f the passes of the housing relative toeach other that the finished product would in a better way fulfill therequirements as regards shape and uniform diameter. But again and againit was found that also by this last mentioned arrange- 'operation' ofthe plant. This in turn'made it necessary to iconsiderablyincrease thespeed of a the wire leavingtheifinishingrolls.

- Also this expedient involved certain inSur- V mountabledifiicu1ties,': becausewith the-increase in-thespeed thetuning of thepasses and'their 59 speed became much more difiicult, entirelyaside fromthefact-that thegreat increase in'speedalso entailed certain ."drawbacksinthe operation of theplant, especially aslregardsaccidents.

Thereupon, one attempted to 'operatethe-last 95 housings offinishingrolls no longer bymeans .of gears or belt drive, but to ,equipeachlhousing of the two parallel :groups of finishingrollswith aseparate -motor, .which experiment, however,.= was a complete. failure,because also-in this instance}? thediificulties of regulating the speed,especially of the last fast running finishingrolls, ,could not beovercome, which difdculties' it had,been .im- Pos ible to foresee-,1 v 1Now, the objectofthe present invention is to 15 so. arrange thehousingsand .to provide such a drive as to: thereby completely 1eliminate the above noted difliculties and drawbacks asre-' gards therelative,adjustability" of the various housings in I respect of, speedand theituning t of the successive passes; have discovered-that theabove'difiiculties :can be-overcome, if the rotating masses of theseveral housings to be regulated arebrought into such a proportion tothe 7 various speeds that the regulation and tuning of the housingsrelative to each other can be effected practically without stages, as isabsolute-' 1y required by a continuous rolling operation. Thepresenti'nvention is .based on the discovery that the speed of the wireas it leaves the finish- 99 ing rollsmust not be increased but ratherdecreased, and must be maintained within such lim- 7 its as to fullyinsure a practical control of each single speed, and to facilitate thisobject by a considerable reduction of the rotating masses to becontrolled as compared with the designs heretofore used. I Y

In order to insure economical operation by way of a'sufficiently largeoutput, the'plant, in ac- .cordancewith this invention, is so designedthat not only two but more than two wires simultaneously 'pass parallelto each other through independent sets of finishingrolls. Obviously,with such an increase ofparallel wires, the speed of the finishing rollscanbe-so much decreased as 9 to insure a profitable output.

On the annexed drawing, there is shown in Fig. l diagrammatically a wirerolling mill embodying the invention; Fig. 2 is a detail view of agenerator set used for driving the separate motors, 1

obtained, each individual roll of the'groups of finishing rolls isconveniently equipped with a direct electric driving motor, the rotorelement of which, because of a special design of the motor, has thesmallest possible dimensions;

Due to this expedient of reducing the rotating masses, a means isafiorded to so relatively tune, without stages, the speed of the variousrolls in but a very small fraction of a second (aboutsone hundredth of asecond) as is absolutely-required by a smooth continuous rollingoperation. On

the drawing, there are indicated at "I, 8 and 9 the :electric motor'sfor driving the rolls of the firstthree groups of housings 1,2 and 3.-.'The parallel disposed groups of the sets of:finishing..rolls,-.indicated-at 4, L5 andfi are shown on the drawingasj-being-zequipped with van indi- -.vidual driving motor 10 "and 11respectivelyifor =each Efinishing iroll. 'jMy invention, however, is notlimited .to this arrangement, because instead of each :roll:havingitsindividual driving motor, each-pair ofrolls can .hedriven by acommon motor, iprovided only ithatxthe above said condition of :the@rotating masses being reduced 'to =-a:m1nimum is fulfilled, inaccordance with :the :present invention. Current may be supplied to thevarious=motors, 7, 8,.9, :10 and '11 bya so-called Leonardgenerating'set shown-at 12in Fig. 2, which'has a special generator foreach group of housings. I a, a a

While I have shown and described an embodiment'of my invention, I havedone so by way 0f illustration, and my invention, therefore, is notlimitecltheretop I a Iclaim as my invention: 7

1."-In a-eontinuous wire mill, the combination with 'a'plurality ofsuccessively disposed groups ot "primary and intermediate housingsdesigned to deliver more than two pre-rolled bars, of more than twogroups of finishing housings disposed parallel with each other, each ofsaid lastnamed groups being arranged toreceive from said group ofintermediate housings but one bar for final rolling.

2. In a continuous wire mill, the combination with ,a plurality ofsuccessively arranged groups of primary and intermediate housingsdesigned to deliver more than two pre-rolled bars, of more than twogroups of finishing housings disposed parallel with each other, each ofsaid last-named groups receivingbut one bar for final rolling, a drivingmotor for-operating each of said groups 0i primary and intermediatehousings, and a separate driving motor for each finishing roll ofsaidgroups of finishing housings.

3. "In a continuous wire mill, the combination withia plurality ofsuccessively arranged groups of primary and intermediate housingsdesigned to deliver more than two pre-rolled bars, of

ingmotors.

4. In a continuous'wire mill, the combination with a plurality ofsuccessively arranged groups of primary and intermediate housingsdesigned to deliver more than two pre-rolled bars, of more thantwogroups of finishing housings disposed parallel with eachother, each ofsaid last-named groups receiving but one bar from said groupofintermediate rolls for final rolling, an electric ,motor for-operatingeach group of said primary stantly respond to any impulse forcontrolling the desired speed. v p

JOSEF GASSEN.

control relative to the'said first mentioned driv-

